I would just use the RGB0 bit of mode 33 as G0 Bit of mode 32, which is
what you probably do already.

There is no perfect translation, since mode 33 has 64 clean grey levels,
while mode 32 has only 32. There will be a minimal green tint in mode 32
where RGB0 of mode 33 was set, but almost not noticeable.
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